Aside from the pin-conversion (15pin Famicom to 7pin Super Famicom controller port), the device contains some electronics to add a SNES-controller ID code, and a more complicated transmission protocol for entering the data transfer mode.
It is supported by: Turbo File Twin is for the Super Famicom, and was released around 1995.
[1] 4×8 kilobytes are used in the four TFII-modes (emulating a Turbo File II with Turbo File Adapter), and the remaining 128 kilobytes are used for a new SNES-specific "STF" mode.
The STF mode is supported by: Turbo File GB is for the Game Boy.
Data is stored on memory cards that connect to the device.